Classical Crofton, Hurwitz and Masotti formulas for the visual angle of convex sets are reinterpreted as integrals of densities w.r.t. the canonical measure on pairs of lines, with new simpler proofs given.
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Integral Geometry about the visual angle of a convex set
Classical Crofton, Hurwitz and Masotti formulas for the visual angle of convex sets are reinterpreted as integrals of densities w.r.t. the canonical measure on pairs of lines, with new simpler proofs given.